Mechanical movement.



' PATENTED DEC. 10, 1907.

L. GRIFFITH. MECHANICAL MOVEMENT.

APPLIOATION FILED MAR; 31, 1905.

Inventor. 3

THE NpRRlS PETERS cm, WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

LAWRENCE GRIFFITH, OF YONKERSTNEW YORK, ASSIGNOR TO THE HALL SIGNAL COMPANY,

A CORPORATION OF MAINE.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented. Dec. 10, 1907.

My invention relates to mechanical move.

ments and its object is to produce a stroke of the working part greater than that of the part acted upon by the force applied and when fluid or gas under pressure is the force used to provide means whereby the loss by leakage may be greatly reduced or done away with.

The invention is particularly applicable in the operation of railway traffic controlling devices and I hereinafter describe it in connection with arailway signal having reference to the accompanying drawings in which similar characters of reference indicate similar parts throughout the various views of which.

Figure 1 is a vertical section of my device,

its connection with the railroad being shown diagrammatically, and Figs. 2, 3 and '4 are -detail views of modifications.

1 is the semaphore blade of a railway signal. It is held in its normal or danger position, that shown in the drawing, by counter balance 2. of rod 3, throws blade 1, down or to safety position in the usual manner.

4 is the casing for the device and is adapted to inclose the storage tank 5, reducing valve 6, controlling valve 7, with electromagnets 8 and 9 and battery 10 for operating valve 7.

The section 11 of the railway tracks is insulated by insulated rail-joints, 12, and the circuit of battery 13 is normally closed. The presence of wheels 14 on said section 11 short-circuits battery 13, thereby.denergiz-' ing magnet 9, the armature of which is returned to normal position by gravity,

' spring, or similar devices, and opening valve -7. Within said casing 4 is also contained my new device which I now proceed to describe. 15 is a casing for the lower part which supports diaphragm 16. Pipe 17 communicates with said casing 15 beneath said diaphragm 16 and with valve 7, so that when valve 7 is opened the force passing The upward movement I therethrough will be exerted on said diaphragm and raise it. Resting on said diaphragm 16 and working with it is block 18, the upper part of which fits tightly and is adapted to work as a piston within the part 15 of the casing 15. The part 15 of the casing is smaller than the part 15 and within it piston 20 is adapted to work. Within the casing and between piston 20 and block 18 is a liquid 19. 21 is a pipe and valve for supplying or removing said liquid 19. As the part 15 with its piston 20 is smaller than the part 15 with the block 18 an upward movement ofblock 18 will produce a greater upward movement of piston 20 and conversely a downward movement of piston 20 will produce a lesser downward movement of block 18. Piston 20, carries rod 3 above mentioned.

In Fig. 2, I have shown the force from pipe 17 extended directly on block 18 without the intervention of a diaphragm. When the dia hragm is used as in Fig. 1 there is 'none 0 the leakage which occurs from the operation of a piston within a cylinder.

In Fig. 1 by dotted lines 23, I-have indicated how the invention may be connected with a pneumatic or other fluid pressure system instead of with the storage tank 5. It being understood that the pi e represented by 23 may lead to any of t e well-known fluid-pressure devices.

I donot limit the invention to .the above described means of moving block 18. For instance, as shown in Fig. 3, it may move by the action of armature 24, when electromagnet 25 is energized.

Another form of my invention is shown in Fig. 4. The part 15 of casing 15 a proaching the part 15 is oonically shape and is filled with anti-friction balls 22. Of course,

instead of liquid or balls any substitute sists of a casing covered by a diaphragm said dia hragm being mechanically connected wit a moving part of a mechanical movement comprising two communicating chambers of unequal cross-section a block adapted to fit and work in each of said chambers and a substance adapted to fill the space between said blocks and to readily change its form so as to pass from one chamber to the other and to transmit motion to one'of said blocks as the other is moved.

2. In a railway traffic-controlling device, the combination of a part to be moved, a supply of liquefied gas, means for operating the part to be moved by the gas, which consists of a moving part of a mechanical move ment comprising two communicating cham- LAVVRENOE GRIFFITH.

In presence of FRANCIS L. FIELD, EDMUND E. FIELD, Jr. 

